Allow for a Staging option for Teams copy.

Staging would create the Team, M365 Group, SharePoint site, create permissions groups, etc. but wouldn't populate any content, members/owners, messages, etc.
This would allow for a faster migration time by allowing the Teams structure to be created separate of the content migration.

Of course you would also need to have the ability to do a 2nd portion of the migration separate from the staging portion. (as of 15.0.1 this could be the incremental copy for Teams.)